Renewable fuse



G. D. FERNANDEZ.

' RENEWABLE FUSE,

APPLICATION FILED 0CT.16, 1919.

Patented Aug. 10, 1920.

GUY D. FERNANDEZ, OF HADDON HEIGHTS, NEW JERSEY.

RENEWABLE FUSE.

Specification of Letters Patent.

Patented Aug. 1.0, 1920.

Application filed October 16, 1919. Serial No. 331,028.

To all whom it may concern Be it known that I, GUY D. FERNANDEZ, a cit zen of the United States, residing in lladdon Hei hts, New Jersey, have invented Renewable P uses, of which the following is a specification.

()ne object of this invention is to provide a renewable fuse of the cartridge type which while conforming to various requirements as to certainty and safety of operation, shall be relatively simple in construction, inexpensive to manufacture and capable of be mg quickly and conveniently renewed as well as convenient to insert in and remove from its clips or holding devices.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying drawings. in which:

Figure 1 is a plan view of a renewable fuse element, embodying my invention;

Fig. 2 is plan showing the fuse element of Fig. 1 with its fusibleportion and parts of its terminals mounted within an inclosing insulating tube;

Fig. 3 is a side elevation of the outer cas- .ing or capsule;

Fig. 4; is a perspective view of the com- .plete fuse made in accordance with my invention; and

Fig. 5 is an end shown in Fig. 4.

In the above drawings. 1 and represent T-shapcd pieces of relatively flexible sheet copper or other metal of the necessary dimensions to carry the current for which the fuse may be intended. The stem portions of these terminals are electrically connected by relatively fusible wire or other body of metal 3 soldered or otherwise in good elec trical connection with them and of the predetermined cross section required to carry a definite current before melting.

This renewable element is inserted within a tube 4 of insulating material having crimped or otherwise secured to it flanged metallic caps 5 whose ends are slotted to provide for the passage of the stems of the sheet metal terminals 1 and 2,said tube being filled as usual with suitable non-combustible insulating powder designed to extinguish the are formed upon the fusing of the part 3.

In accordance with my invention the head :12 of one of the terminals as 2 is temporarily coiled or rolled so that its diameter is someelevation of the fuse what less than that of the caps 5 so that it, with the tube 4, may be laced within an outer or inclosing capsule also of insulating material which has fastened around its ends metallic rings 8 and 9. The length of tlllS capsule 7 is substantially that of the tube 4 and its caps 5, so that after the introduction of said tube within it, the stem portions of the two terminal elements 1 and 2 may be bent at right angles over the caps 5 and the end of the capsule 7, after which said stems are again bent at right angles toward each other so as to bring their head portions 09 tangent to the outer surfaces of the rings 8 and 9 respectively ;-the coiled head having been first unrolled. Said head portions may then be curved or bent around. and made substantially concentric with said rings 8 and 9, whereupon the fuse as a whole is ready for use, the curved heads fitting between the spring clips of the well known forms of fuse holders designed to receive ferrule type fuses.

If desired, the head portions to of the terminals 1 and 2 may have through their central portions holes for the reception of screws .10 designed to be threaded into suit able holes in the rings 8 and 9 respectively, although these may be omitted without departing from my invention.

In any case it will be noted that since the clips of the fuse holders directly engage the heads a; of the terminal members 1 and 2, there is a corresponding direct electrical connection between said clips through the latter and the fusible element 3 which reduces the resistance of the device and tends to prevent or reduce heating.

Obviously after the fusible element 3 has been melted or broken by an excessive current flow, the tube 4 with the terminal meInbers 'l. and :2 may be removed with the utmost ease from the capsule or main tube 7, since said terminal members may be withdrawn through the slots in the caps 5 of said tube i which may then be drawn longitudinally out of said capsule and another I tube with a perfect fuse inserted.

From the above description it will be seen that the device as a whole is of the utmost simplicity, that its renewable element may be inserted and a burnt out element removed with the utmost ease and convenience, and that the construction is relatively inexpensive as well as of such a nature as to provide a minimum number of contacts.

I claim:

l. A fuse element comprising two sheet metal terminal members each having a central stem and a flexible laterally extending head; with a relatively fusiblelink having its ends in permanent electrical connection with the stems of said terminal members.

2. A fuse element consisting of two flexible elongated sheet metal terminal members and a single relatively fusible structure in permanent electrical connection with the central portions of said members in com bination with an insulating tubeinclosing the fusible structure and having the terminal members bent around its ends.

I 3. The combination of an insulating tube having slotted metallic caps; and a fuse element consisting of two sheet metal terminal members each having a stem portion projecting through the slots of the cap into the tube and each also having a laterally projecting flexible head portion outside of the tube; with a relatively fusible link connecting the stemportions of the terminal elements within the tube.

4. A fuse capsule consisting of a tube of insulating material; metal rings on the ends ofsaid tube; and a renewable fuse element within said tube including terminal members having adjustable sheet metal portions bent around the outside of the metal rings substantially concentric therewith; with a relatively fusible link electrically connecting said terminal members within the tube.

5. A fuse capsule consisting of an outer tube of insulating material, having metallic rings mounted on its ends; a second tube of insulating material within said firsttube; a relatively fusible link within the second tube; with terminal members connected to said link, respectively extending across the ends of the tubes and including portions respectively curved around the rings of the outer tube.

6. The combination of a tube of insulating material; a second insulating tube removably mounted within the first tube; a relatively fusible link in the second tube; with terminal members connected to the link extending respectively across the ends of the two tubes and including flexible portions respectively bent around and substantially concentric with the ends of the outer tube.

7. The combination of an insulating tube having metal rings mounted on its ends; a second tube mounted within the first tube and having caps provided with openings; a relatively fusible link within the inner tube; "l -shaped terminal members of relatively flexible metal mounted With their stem portions extending through the openings of said caps into the second tube and electrically connected to the ends of the fusible link, said terminal members being bent across the ends of the tubes respectively and thereafter bent over the rings of the outer tube the head portions of said members being curved around said rings substantially concentric therewith.

In witness whereof I afiix my signature.

GUY D. FERNANDEZ. 

